Whenever a specific QR code is displayed in the Gstreamer video pipeline in Galicaster it can be used to pause the recording. no video or audio is written to file during this time. This allows a novel method to do on-the-fly live editing of captured video and audio. This also removes the need for editing software or editing skills. the only requirement is to include an agreed QR code image into the slides or to be displayed on camera.
QR codes have up to 30% error correction redundancy, for real world application its worth considering a high-redundnacy QR code image being used with this plugin. http://blog.qrstuff.com/2011/12/14/qr-code-error-correction
Use of this plugin is optimised with mono-stream video of the slides. using a camera or FMV may have an impact on recording
performance (hardware dependant). Its worth looking at the QRcode config options rescale, drop_frames and buffers
to help tune performance.
Using this plugin to do the editing on the Opencast server was planned but not implemented therefore the options
mp_add_edits and mp_add_smil are best left as False
To activate the plugin, add the line in the plugins section of your configuration file
[plugins] qrcode = True
True: Enables plugin. False: Disables plugin.
And set the recording pipeline pause type
[recorder] pausetype = recording
recording: GST pipeline keeps running, nothing recorded when paused.
pause
[qrcode] pause_mode = hold hold_code = pause stop_code = stop start_code = start rescale = 640x360 mp_add_edits = False mp_force_trimhold = False mp_add_smil = False drop_frames = True buffers = 200 hold_timeout = 1 ignore_track_name =
| Option | Type | Parameter | Description |
|---|---|---|---|
| pause_mode | string | hold, start_stop | Specifies the pause behaviour, either pause while a QR code is displayed automatically restarting or pause and start again on two separate QR code |
| hold_code | string | any | This will match the displayed QR code and pause the recording until the QR code is removed |
| stop_code | string | any | This will match the displayed QR code and will pause a recording indefinitely |
| start_code | string | any | This will match the displayed QR code and will start a paused recording |
| rescale | string | widthxheight | Rescales the input frames for analysis. a lower resolution helps ease processing load |
| mp_add_edits | boolean | True, False | Add edit times into the mediapackage for possible further processing in Opencast (NOT IMPLEMENTED) |
| mp_force_trimhold | boolean | True, False | Force the mediapackge with the QR code editing recording to use a trimHold workflow in Opencast |
| mp_add_smil | boolean | True, False | Add smil file into the mediapackage to be used for possible further processing in Opencast (NOT IMPLEMENTED) |
| drop_frames | boolean | True, False | Drop frames from the pipeline buffer in the Gstreamer pipeline. useful when processing FMV so the pipeline doesnt slow down with QRcode |
| buffers | integer | 200 | Setting the 'max-size-buffers' value for the gstreamer pipeline. useful to configure so pipeline doesnt slow down with QRcode |
| hold_timeout | integer | time: seconds | The period of time to wait after the 'hold_code' is removed before resuming recording in the pipeline. |
| ignore_track_name | string | list: camera,capture1.. | This will turn off QRcode scanning of the track name that matches in this list. |